FRIENDS OF MOUNT TAM — 258-2410; www.friendsofmttam.org. April 30: Two- to three-mile hike leaves at 5:30 p.m. from the Rock Spring trailhead. May 3: Five- to seven-mile hike with up to 1,500-foot elevation gain leaves at 10 a.m. from the Rock Spring trailhead. Back between 1:15 and 2:30 p.m. May 4: Moderate seven- to nine-mile hike with up to 2,200-foot elevation gain leaves at 10 a.m. from the Rock Spring trailhead. Back between 1:15 and 2:30 p.m.

MARIN AUDUBON SOCIETY — 299-2514; www.marinaudubon.org. May 1: "Las Gallinas Ponds Birding Walk." Meet at the end of Smith Ranch Road in San Rafael. 9 a.m. to noon. May 4: "Mount Burdell Birding Walk." Meet at the end of San Andreas Drive in Novato. 8 to 11 a.m.

MARIN COUNTY PARKS AND OPEN SPACE — 473-6387; www.marincountyparks.org. May 4: "Big Rock Ridge to the Summit" with David Wimpfheimer. Meet at the Big Rock trailhead on Lucas Valley Road in San Rafael. 9 a.m. to 2 p.m.

POINT REYES OUTDOORS — 663-8192; www.pointreyesoutdoors.com. Weekends: Tule elk kayaking tours for all ages. No experience required. 10 a.m. to 2 p.m. $85. Weekends: Morning, full day and sunset wildlife kayaking tours on Tomales Bay. Call for reservations. Private kayaking tours are also available anytime. Mountain bike rentals are available at 11401 Highway 1 in Point Reyes Station for $35 to $42 a day.